Theoretical and numerical analysis of reinforced concrete beams with confinement reinforcement
This paper discusses the use of confinement in over-reinforced concrete beams. This reinforcement consists of square stirrups, placed in the compression zone of the beam cross-section, in order to improve its ductility. A parametric numerical study is initially performed, using a finite element comp...
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doaj-00a62ac5cc31489b9bd83752c0b409702020-11-24T22:26:46ZengInstituto Brasileiro do Concreto (IBRACON)Revista IBRACON de Estruturas e Materiais1983-419511173010.1590/S1983-41952008000100002S1983-41952008000100002Theoretical and numerical analysis of reinforced concrete beams with confinement reinforcementR. G. Delalibera0J. S. Giongo1Universidade de São PauloUniversidade de São PauloThis paper discusses the use of confinement in over-reinforced concrete beams. This reinforcement consists of square stirrups, placed in the compression zone of the beam cross-section, in order to improve its ductility. A parametric numerical study is initially performed, using a finite element computational program that considers the material nonlinearities and the confinement effect. To investigate the influence of the transverse reinforcing ratio on the beam ductility, an experimental program was also conducted. Four over-reinforced beams were tested; three beam specimens with additional transverse reinforcement to confine the beams, and one without it. All specimens were fabricated with a concrete designed for a compressive strength of 25 MPa. The experimental results show that the post-peak ductility factor is proportional to the confining reinforcement ratio, however the same is not observed for the pre-peak ductility factor, which varied randomly with changes in the confining reinforcement ratio. It was also observed from the experiments that the confinement effect tends to be smaller close to the beam neutral axis.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1983-41952008000100002&lng=en&tlng=enbeamsconfinement reinforcementductility |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
R. G. Delalibera J. S. Giongo |
spellingShingle |
R. G. Delalibera J. S. Giongo Theoretical and numerical analysis of reinforced concrete beams with confinement reinforcement Revista IBRACON de Estruturas e Materiais beams confinement reinforcement ductility |
author_facet |
R. G. Delalibera J. S. Giongo |
author_sort |
R. G. Delalibera |
title |
Theoretical and numerical analysis of reinforced concrete beams with confinement reinforcement |
title_short |
Theoretical and numerical analysis of reinforced concrete beams with confinement reinforcement |
title_full |
Theoretical and numerical analysis of reinforced concrete beams with confinement reinforcement |
title_fullStr |
Theoretical and numerical analysis of reinforced concrete beams with confinement reinforcement |
title_full_unstemmed |
Theoretical and numerical analysis of reinforced concrete beams with confinement reinforcement |
title_sort |
theoretical and numerical analysis of reinforced concrete beams with confinement reinforcement |
publisher |
Instituto Brasileiro do Concreto (IBRACON) |
series |
Revista IBRACON de Estruturas e Materiais |
issn |
1983-4195 |
description |
This paper discusses the use of confinement in over-reinforced concrete beams. This reinforcement consists of square stirrups, placed in the compression zone of the beam cross-section, in order to improve its ductility. A parametric numerical study is initially performed, using a finite element computational program that considers the material nonlinearities and the confinement effect. To investigate the influence of the transverse reinforcing ratio on the beam ductility, an experimental program was also conducted. Four over-reinforced beams were tested; three beam specimens with additional transverse reinforcement to confine the beams, and one without it. All specimens were fabricated with a concrete designed for a compressive strength of 25 MPa. The experimental results show that the post-peak ductility factor is proportional to the confining reinforcement ratio, however the same is not observed for the pre-peak ductility factor, which varied randomly with changes in the confining reinforcement ratio. It was also observed from the experiments that the confinement effect tends to be smaller close to the beam neutral axis. |
topic |
beams confinement reinforcement ductility |
url |
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1983-41952008000100002&lng=en&tlng=en |
work_keys_str_mv |
AT rgdelalibera theoreticalandnumericalanalysisofreinforcedconcretebeamswithconfinementreinforcement AT jsgiongo theoreticalandnumericalanalysisofreinforcedconcretebeamswithconfinementreinforcement |
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1725751687522549760 |